How much is "1 stone" in lbs?
Is there a calibrated stone someplace?
Ye Olde Stone of The Unchanging Weight?
It's a bit of an oddity. originally real stones were used as local measures and could have been anything in weight. Eventually there became standards which varied from the Edinburgh stone ( about 24 lbs IIRC) and various others which might even have been different in the same area for varying items such as wool or meat. It's now standardised at 14lbs.